How hard is it to get a 7734 out of the case and repairing a pusher

[gplracer]

So my Tudor 7032 needs to have a pusher repaired. The bottom pusher no longer works. when you unscrew the pusher it comes out of the case. I know to fix this I will have to remove the 7734 from the case. I assume that I will need to push the pin that secures the crown/stem. Then I have to unscrew the fasteners that hold the movement in the watch? Anything else that I need to know or be careful of? 

 

Also, are there any tutorials on line to repairing the pusher? I have two nicer pusher but I am not sure the thread pitch on them is correct. Thanks for you time and help.